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WAEC Biology 2010 Question 27

Question 27

Photosynthesis and Plant Nutrition

In testing for starch in a leaf, the leaf is first boiled in water for about a minute so that the

  1. A.cell walls are hardened.
  2. B.cells are killed.
  3. C.chlorophyll is dissolved out.
  4. D.iodine will penetrate.
Show the answer and explanation

Answer: B (cells are killed.)

Explanation

Boiling in water kills the cells and stops enzyme action; the chlorophyll is removed later with alcohol, not water.